“Whoever makes a will as death approaches, and his will is in accordance with the book of Allah (SWT) it will be an expiation for whatever he did not pay of his Zakah during his lifetime.”  

قَالَ رَسُولُ اللَّهِ ﷺ مَنْ حَضَرَتْهُ الْوَفَاةُ فَأَوْصَى وَكَانَتْ وَصِيَّتُهُ عَلَى كِتَابِ اللَّهِ كَانَتْ كَفَّارَةً لِمَا تَرَكَ مِنْ زَكَاتِهِ فِي حَيَاتِهِ  

[Machine] From the Messenger of Allah, ﷺ , he said, "Whoever encounters death and puts his will in the Book of Allah, it will serve as expiation for what he has missed in paying his zakat during his lifetime."  

عَنْ رَسُولِ اللهِ ﷺ قَالَ «مِنْ حَضَرَهُ الْمَوْتُ فَوَضَعَ وَصِيَّتَهُ عَلَى كِتَابِ اللهِ كَانَ ذَلِكَ كَفَّارَةً لِمَا ضَيَّعَ مِنْ زَكَاتِهِ فِي حَيَاتِهِ»